Ceramic Water Filter, Twin-pack, Candle Filter Offer is for two ceramic filters size 2 inch x 10 inch - compatible with some Berkey, Doulton and other models Ceramic element has a 0.2 micron efficiency - contains GAC / granulated activated carbon with other resins - labs tests available - made in the USA! The filters are silver-impregnated by heat infusion to prevent bacterial growth inside the housing- provides a hostile environment for all microbiological organisms These filters are suitable to finish tap water but may also be used to filter rainwater, well water or even water from floods, rivers, streams and other natural sources. Our filters have been used in disaster relief efforts around the world. Designed for gravity feed - 5/8 inch filter stem - easy installation - comes with washer and nut. Flow rate without pressure is approximately 1 gallon per hour per filter after the filters are fully saturated. The ceramic element can be cleaned with a non-scratch pad or a soft brush up to 100 times. Avoid all soaps, detergents or other cleaning agents.